package com.woniuxy.company5.util;

/**
 * @author ：fengSir
 * @date ：Created By 2022-09-05 15:30
 * @description ：TODO
 */

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

import java.util.Date;

@Component
@Data
@ConfigurationProperties(prefix = "token.jwt")
public class JwtUtils {

    //Base64对该令牌进行编码
    private String secret;

    //令牌过期时间 此处单位/毫秒
    private Long expireTime;

    //生成Jwt
    public String generateToken(String username){
        Date nowDate = new Date();

        Date expireDate = new Date(nowDate.getTime() + 1000 * expireTime );

        return Jwts.builder()
                .setHeaderParam("typ", "JWT")
                .setSubject(username) //将来可以得到验证的主体信息
                .setIssuedAt(nowDate)
                .setExpiration(expireDate)// 7天过期
                .signWith(SignatureAlgorithm.HS512, secret)
                .compact();
    }

    //解析Jwt
    public Claims getClaimsByToken(String jwt){
        try{
            return Jwts.parser()
                    .setSigningKey(secret) //密钥
                    .parseClaimsJws(jwt)
                    .getBody();
        }catch (Exception e){
            return null;
        }

    }

    //判断Jwt是否过期
    public boolean isTokenExpired(Claims claims){
        return claims.getExpiration().before(new Date());
    }

}
